There's a hole in my ceiling

While I was out on medical leave our hallway bathroom ceiling began to drip with water.  Most likely it was from old pipes between the floors but this is what we had to live with for three months until the "responsibility" issues were resolved and the contractor actually kept an appointment (he averaged 1 for 15!).

After awhile the plaster started coming apart during bath time.  Technically the contractor never finished the job.  He was supposed to come back and paint it but he never did!!!